Low Elevation
< 420 feet above mean sea level
Low Place
Illinois River
Low Quad Name
Glasford
Low PLSS
4-7-6N-6E
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 830 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Edelstein
High PLSS
4-33-11N-7E
High Geology
Buda Moraine
Area
623.69 square miles
Total Relief
410 feet
Percent Slope
1.82%